US5673294A
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Adaptive maximum likelihood sequence estimation apparatus and adaptive maximum likelihood sequence estimation method
Assignee: Toshiba Corp
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Filing: 1996-08-09
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Granted: 1997-09-30
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Expires: 2016-08-09
Abstract
Abstract An adaptive maximum likelihood sequence estimation apparatus includes a first estimation unit for estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response. A second estimation unit estimates an estimated received signal at time k on the basis of a known signal sequence or the transmission signal sequence estimated by the first estimation unit, and a transmission path impulse response estimated at time k-1. An error signal generation unit generates an error signal on the basis of a received signal at time k and the estimated received signal at time k. A third estimation unit estimates a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal. Furthermore, the third estimation unit estimates a transmission path impulse response by a non-recursive calculation during the reception period of a known signal sequence of the received signal, and estimates a transmission path impulse response by a recursive calculation during the reception period of an unknown data signal sequence of the received signals following the known signal sequence period.
Inventors
- 👤 Minoru Namekata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:38
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03178; H04L25/03337; H04L2025/03777; H04L2025/03783; H04L2025/03796; H04L25/0202; H04L25/0224; H04L25/024; H04L25/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
An adaptive maximum likelihood sequence estimation apparatus comprising: first estimation means for estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response; second estimation means for estimating an estimated received signal at time k on the basis of the transmission signal sequence estimated by said first estimation means and a transmission path impulse response estimated at time k-1; error signal generation means for generating an error signal on the basis of a received signal at time k and the estimated received signal at time k from said second estimation means; and third estimation means for estimating a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal generated by said error signal generation means, wherein said third estimation means comprises means for estimating a transmission path impulse response by a non-recursive calculation on the basis of all candidate sequences which are transmitted during a given finite period and a received signal received during the finite period, and received signal estimation and estimation by said first estimation means are performed using the estimated transmission path impulse response.
Claim 2
Dependent Claim
193 words
An adaptive maximum likelihood sequence estimation apparatus comprising: first estimation means for estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response; second estimation means for estimating an estimated received signal at time k on the basis of the transmission signal sequence estimated by said first estimation means and a transmission path impulse response estimated at time k-1; error signal generation means for generating an error signal on the basis of a received signal at time k and the estimated received signal at time k from said second estimation means; and third estimation means for estimating a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal generated by said error signal generation means, wherein said third estimation means comprises means for estimating a transmission path impulse response by a non-recursive calculation on the basis of all candidate sequences which are transmitted during a given finite period and a received signal received during the finite period, and received signal estimation and estimation by said first estimation means are performed using the estimated transmission path impulse response.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1, wherein said third estimation means comprises means for estimating an optimal transmission path impulse response by executing the non-recursive calculation processing and the estimation by said first estimation means by periodically using an unknown data signal sequence.
Claim 4
Dependent Claim
84 words
An apparatus according to claim 1, wherein said third estimation means comprises means for estimating an optimal transmission path impulse response by executing the non-recursive calculation processing and the estimation by said first estimation means when a minimum path metric value of path metrics inherent to states of a state transition diagram in the estimation by said first estimation means has exceeded a predetermined path metric threshold value as a result of the estimation by said first estimation means using an unknown data sequence.
Claim 5
Dependent Claim
193 words
An adaptive maximum likelihood sequence estimation method comprising: the first estimation step of estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response; the second estimation step of estimating an estimated received signal at time k on the basis of the transmission signal sequence estimated in the first estimation step and a transmission path impulse response estimated at time k-1; the error signal generation step of generating an error signal on the basis of a received signal at time k and the estimated received signal at time k; and the third estimation step of estimating a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal generated in the error signal generation step, wherein the third estimation step comprises the step of estimating a transmission path impulse response by a non-recursive calculation on the basis of all candidate sequences which are transmitted during a given finite period and a received signal received during the finite period, and received signal estimation and estimation in the first estimation step are performed using the estimated transmission path impulse response.
Claim 6
Dependent Claim
193 words
An adaptive maximum likelihood sequence estimation method comprising: the first estimation step of estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response; the second estimation step of estimating an estimated received signal at time k on the basis of the transmission signal sequence estimated in the first estimation step and a transmission path impulse response estimated at time k-1; the error signal generation step of generating an error signal on the basis of a received signal at time k and the estimated received signal at time k; and the third estimation step of estimating a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal generated in the error signal generation step, wherein the third estimation step comprises the step of estimating a transmission path impulse response by a non-recursive calculation on the basis of all candidate sequences which are transmitted during a given finite period and a received signal received during the finite period, and received signal estimation and estimation in the first estimation step are performed using the estimated transmission path impulse response.
Claim 7
Dependent Claim
44 words
A method according to claim 4, wherein the third estimation step comprises the step of estimating an optimal transmission path impulse response by executing the non-recursive calculation processing and the estimation in the first estimation step by periodically using an unknown data signal sequence.
Claim 8
Dependent Claim
85 words
A method according to claim 4, wherein the third estimation step comprises the step of estimating an optimal transmission path impulse response by executing the non-recursive calculation processing and the estimation in the first estimation step when a minimum path metric value of path metrics inherent to states of a state transition diagram in the estimation in the first estimation step has exceeded a predetermined path metric threshold value as a result of the estimation in the first estimation step using an unknown data sequence.
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